CN110498567A - Facultative type MBR treatment tank and equipment and processing method - Google Patents
Facultative type MBR treatment tank and equipment and processing method Download PDFInfo
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- CN110498567A CN110498567A CN201910799670.7A CN201910799670A CN110498567A CN 110498567 A CN110498567 A CN 110498567A CN 201910799670 A CN201910799670 A CN 201910799670A CN 110498567 A CN110498567 A CN 110498567A
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- 238000003672 processing method Methods 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 241
- 239000012528 membrane Substances 0.000 claims abstract description 185
- 239000010865 sewage Substances 0.000 claims abstract description 95
- 238000009826 distribution Methods 0.000 claims abstract description 79
- 239000010802 sludge Substances 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000010992 reflux Methods 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims description 91
- 238000005201 scrubbing Methods 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 23
- 238000012554 master batch record Methods 0.000 claims description 20
- 239000002351 wastewater Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000005202 decontamination Methods 0.000 claims description 3
- 230000003588 decontaminative effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 244000005700 microbiome Species 0.000 abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 abstract description 16
- 239000001301 oxygen Substances 0.000 abstract description 16
- 239000007789 gas Substances 0.000 abstract description 5
- 238000009395 breeding Methods 0.000 abstract 1
- 230000001488 breeding effect Effects 0.000 abstract 1
- 241000894006 Bacteria Species 0.000 description 16
- 239000003344 environmental pollutant Substances 0.000 description 14
- 231100000719 pollutant Toxicity 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 12
- 229910052698 phosphorus Inorganic materials 0.000 description 12
- 239000011574 phosphorus Substances 0.000 description 12
- 238000005265 energy consumption Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000005416 organic matter Substances 0.000 description 8
- 238000005273 aeration Methods 0.000 description 6
- 238000011001 backwashing Methods 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000001546 nitrifying effect Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of facultative type MBR treatment tanks and equipment and processing method comprising inhalant region, hybrid reaction area, the UF membrane exhalant region being arranged from bottom to top, wherein the bottom of inhalant region is equipped with water distribution pipe, and water distributor is connect with impulse generator；The UF membrane exhalant region is equipped with UF membrane case, the lower section of UF membrane case is equipped with gas distribution pipe, gas distribution pipe is cleaned blower with film and is connect, simultaneously, reflux line is equipped between inhalant region and UF membrane exhalant region, the refluxing opening of reflux line is arranged close to UF membrane case, and the water outlet of reflux line connect setting with water distribution pipe.Hydraulic mixing is carried out to sludge and water by the pulse water flow that water distributor periodically generates, it is washed away in conjunction with UF membrane box outer wall attachment of the gas distribution pipe to UF membrane exhalant region, effectively reduce fouling membrane, also the runing time that film cleans blower is reduced, it ensure that water body is in simultaneous oxygen environment, be conducive to the growth and breeding of microorganism in slightly-polluted water, improve sewage treatment purifying rate.
Description
Technical Field
The invention relates to sewage treatment equipment, in particular to a facultative MBR sewage treatment tank, equipment and a treatment method.
Background
In the field of sewage treatment, MBR (membrane bioreactor) is a water treatment process combining a membrane separation unit and a biological treatment unit. Due to the high-efficiency separation effect of the membrane, the separation effect is far better than that of the traditional sedimentation tank, and the interception effect also enables the biological reaction tank to maintain higher microorganism concentration. Therefore, the MBR biological reaction tank has high pollutant removal efficiency, has good adaptability to various changes of water inlet load (water quality and water quantity), and can ensure good and stable water quality of outlet water.
In the aspect of actual operation and maintenance, due to the influence of high sludge concentration (more than 10000 mg/L) in an MBR tank, suspended pollutants, soluble organic matters and microorganisms in the mixed solution are easily attached to the surface of a membrane, so that membrane pollution is caused, the membrane flux is reduced, the membrane needs to be cleaned and replaced when necessary, and inconvenience is brought to operation and management. Therefore, in actual operation, a membrane scrubbing fan needs to be arranged, air is continuously blown in through the fan to blow and sweep the membrane component, attachments on the surface of the membrane are cleaned, and meanwhile oxygen in the air is dissolved in water, so that the concentration of dissolved oxygen in the water can be improved, and the growth of microorganisms is promoted.
MBRs have received particular attention in the field of water treatment, but conventional aerobic MBR processes suffer from several disadvantages, mainly manifested in the following areas:
1. is affected by the high sludge concentration in the MBR tank, and is very easy to cause membrane pollution.
2. The operating power of the membrane scrubbing fan configured by the MBR is generally higher, and in order to avoid membrane pollution, the membrane scrubbing fan continuously operates, so that the energy consumption is higher and the overall operating cost of the process is high.
3. In the common aerobic MBR process, the continuous blowing of the membrane scrubbing fan is 2 times of the aeration rate of the conventional fan, when the membrane scrubbing fan is used for treating lightly polluted wastewater such as urban black and odorous water, domestic sewage in villages and towns and the like, the dissolved oxygen in the water is too high due to excessive aeration, and microorganisms are easily killed due to endogenous respiration due to low organic matter content in the water, so that the treatment efficiency and the effluent quality are influenced.
Disclosure of Invention
The invention provides a facultative MBR sewage treatment tank, equipment and a treatment method aiming at the problems in the prior art, and solves the technical problems of overhigh dissolved oxygen, high energy consumption and easy membrane pollution caused by excessive aeration when the traditional aerobic MBR process is used for treating slightly polluted wastewater.
In order to solve the technical problem, the invention provides a facultative MBR sewage treatment tank, which comprises a water inlet area, a mixed reaction area and a membrane separation water outlet area which are arranged from bottom to top, wherein,
the bottom of the water inlet area is provided with a water distribution pipeline, and the water distribution pipeline is connected with a pulse generator through a connecting pipeline;
the membrane separation water outlet area is provided with a membrane separation box, a gas distribution pipe is arranged below the membrane separation box and is connected with a membrane scrubbing fan through a connecting pipeline,
meanwhile, a backflow pipeline is arranged between the water inlet area and the membrane separation water outlet area, a backflow port of the backflow pipeline is communicated with the membrane separation area and is arranged close to the membrane separation tank, and a water outlet of the backflow pipeline is connected with a water distribution pipeline of the water inlet area.
A facultative MBR sewage treatment device comprises a rotational flow grit chamber, a water distribution tank, a facultative MBR sewage treatment tank and a clean water tank which are sequentially communicated; wherein,
a rotational flow desander is arranged in the rotational flow grit chamber;
the water inlet of the water distribution tank is arranged at the upper end of the tank wall, a filter screen is arranged at the water inlet, and the water outlet of the water distribution tank is arranged at the bottom of the tank wall;
the facultative MBR sewage treatment tank comprises a water inlet area, a mixed reaction area and a membrane separation water outlet area which are arranged from bottom to top, wherein a water inlet of the water inlet area is communicated with a water outlet of the water distribution tank, a water distribution pipeline is arranged at the bottom of the water inlet area, and the water distribution pipeline is connected with a pulse generator through a connecting pipeline; the membrane separation water outlet area is provided with a membrane separation box, and a gas distribution pipe is arranged below the membrane separation box and is connected with a membrane scrubbing fan through a connecting pipeline; meanwhile, a return pipeline is arranged between the water inlet area and the membrane separation water outlet area, a return port of the return pipeline is communicated with the membrane separation area and is arranged close to the membrane separation tank, and a water outlet of the return pipeline is connected with a water distribution pipeline of the water inlet area;
the clean water tank is communicated with the facultative MBR sewage treatment tank through a water production pump.
A facultative MBR sewage treatment method adopts the facultative MBR sewage treatment equipment, and comprises the following steps:
s1, enabling the wastewater to enter a cyclone desanding pool through a water inlet pipeline, and pretreating the wastewater through a cyclone desander to remove hard particles in the wastewater;
s2, enabling the effluent of the rotational flow grit chamber to enter a water distribution tank, and filtering by a filter screen to remove impurities;
s3, enabling sewage to enter a water inlet area of the facultative MBR sewage treatment pool through a water outlet of the water distribution pool, putting powdered activated carbon into the water, mixing the sewage with activated sludge in the facultative MBR sewage treatment pool under the pulse stirring of a water distribution pipeline, carrying out contact reaction, and meanwhile, enabling mixed liquid in the membrane separation area to flow back to the bottom of the facultative MBR sewage treatment pool through a reflux pump;
and S4, continuously raising the water flow after reaction to a membrane separation water outlet area, completing decontamination treatment after MBR membrane separation and filtration, and pumping and conveying the water to a clean water tank through a water producing pump.
Compared with the prior art, the facultative MBR sewage treatment tank, the facultative MBR sewage treatment equipment and the facultative MBR sewage treatment method have the following advantages and beneficial effects:
1. the sewage passes through the filtering action of the rotational flow grit chamber and the screen, so that impurities such as solid particles and fibers in the sewage are effectively intercepted, and the damage to an MBR membrane is avoided.
2. The facultative MBR sewage treatment tank adopts intermittent hydraulic stirring generated by the pulse generator, so that a sludge concentration gradient is formed from bottom to top in the facultative MBR sewage treatment tank, the sludge concentration of the membrane separation area is low, and membrane pollution is reduced.
3. The pulse generator can periodically carry out hydraulic scouring on the surface of the membrane through the water distribution pipe, and the use of the membrane scrubbing fan is combined, so that the membrane pollution can be effectively reduced, the running time of the membrane scrubbing fan is reduced, and the energy consumption is reduced.
4. The mixed liquid of backwash pump with the membrane separation zone flows back to the district of intaking, forms the inner loop, has not only avoided the gathering of a large amount of suspended pollutants, soluble organic matter and microorganism, has also avoided it to pile up at membrane separation case outer wall and has adhered to, has reduced the speed that the membrane pollutes.
5. The use of combining pulse water distribution system, the membrane is scrubbed the fan and is operated frequency reduction, and the oxygen volume that provides membrane bioreactor through the membrane is scrubbed the fan and is reduced, and aquatic dissolved oxygen is lower, is the facultative environment, is favorable to the growth and reproduction of the microorganism in the slightly polluted water, and the interception effect of membrane has in addition guaranteed the high concentration of activated sludge in the facultative MBR sewage treatment pond.
6. Along with the intermittent operation of the membrane scrubbing fan, the biological reaction zone alternately has an anaerobic/anoxic + facultative-anaerobic/anoxic environment, and provides a good living environment for the growth of nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria, so that biological nitrogen and phosphorus removal is realized through the nitrification and denitrification of the bacteria and the phosphorus absorption and release effects, and the sewage treatment purification rate is improved.
7. When this equipment was applied to the processing of mild contaminated water, can realize being facultative anaerobic type MBR sewage treatment pond in and be facultative anaerobic environment, can effectively get rid of the pollutant, reduce membrane pollution, have the energy consumption low, practice thrift advantages such as taking up an area of.
Drawings
FIG. 1 is a schematic structural diagram of a facultative MBR sewage treatment tank according to the present invention;
FIG. 2 is a schematic structural view of a facultative MBR sewage treatment plant according to the present invention;
FIG. 3 is a schematic diagram of the top view structure of the facultative MBR sewage treatment plant of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
the method aims to solve the technical problems that the traditional aerobic MBR process is used for treating slightly polluted wastewater, and the dissolved oxygen is too high, the energy consumption is high and membrane pollution is easily caused due to excessive aeration. Embodiment 1 of the present invention provides a facultative MBR sewage treatment tank 100, which comprises a water inlet zone, a mixed reaction zone, and a membrane separation water outlet zone, which are arranged from bottom to top,
a water inlet of the water inlet area is provided with a filter screen 301 for pre-filtering impurities in the sewage, as shown in fig. 1, the bottom of the water inlet area is provided with a water distribution pipeline 101, a plurality of water distribution holes with upward openings are uniformly distributed on the water distribution pipeline 101, and the water distribution holes are connected with a pulse generator through a connecting pipeline; the pulse generator is arranged above the facultative MBR sewage treatment tank 100, is communicated with the water distribution pipe through a central siphon pipe, generates pulse fluctuation through the pulse generator, and transmits the pulse fluctuation to the water inlet area through the water distribution pipe 101, so that dissolved organic matters, microorganisms and activated sludge deposited at the bottom of the water inlet area are stirred, the dissolved organic matters, the microorganisms and the activated sludge are fully mixed with sewage, and the sewage purification effect is improved.
The membrane separation water outlet area is provided with an MBR membrane separation box 102, sewage is finally purified after being subjected to MBR membrane separation filtration, in addition, in order to avoid the problems that suspended pollutants, soluble organic matters and microorganisms in mixed liquid are easily attached to the surface of a membrane to cause membrane pollution and the membrane flux is reduced, as shown in figure 1, an air distribution pipe 103 is arranged below the membrane separation box, a plurality of air distribution holes with upward openings are uniformly distributed on the air distribution pipe 103, the air distribution pipe 103 is connected with a membrane scrubbing fan 104 through a connecting pipeline, the membrane scrubbing fan 104 is started to work, the surface of the MBR membrane separation box 102 is swept through the air distribution pipe 103, and the attachments such as the suspended pollutants, the soluble organic matters and the microorganisms attached to the surface of the membrane are blown off from the outer wall of the MBR membrane separation box 102.
In order to further avoid the problem of membrane flux reduction caused by membrane pollution, as shown in fig. 1, a back-washing pipeline 105 is arranged in the membrane separation box, the back-washing pipeline 105 is connected with a clean water pipeline, clean water is introduced into the membrane separation box through the back-washing pipeline 105 through the clean water pipeline, so that the pressure inside the membrane separation box is greater than the pressure outside the membrane separation box, under the action of the pressure, water flow inside the membrane separation box reversely permeates to the outside of the box body, and the generated reverse water flow further washes away attachments attached to the outer wall of the membrane separation box.
Meanwhile, a backflow pipeline 106 is arranged between the water inlet area and the membrane separation water outlet area, a backflow port of the backflow pipeline 106 is communicated with the membrane separation area and is arranged close to the membrane separation tank, and a water outlet of the backflow pipeline 106 is connected with the water distribution pipeline 101 of the water inlet area. Specifically, as shown in fig. 1, the facultative MBR sewage treatment tank 100 includes a transition water tank 107, a water inlet of the transition water tank 107 is connected to the return pipe 106, and a water outlet thereof is connected to the water distribution pipe 101 through a pulse generator. The reflux pipe refluxes the suspended pollutant, the soluble organic matter and the microorganism of membrane separation zone gathering to the bottom of the tank body again, and the pulse power provided by the pulse generator fully mixes and purifies with the sewage entering the tank from the bottom of the tank once more to form an internal circulation, thereby not only avoiding the gathering of a large amount of suspended pollutant, soluble organic matter and microorganism, but also avoiding the gathering of the suspended pollutant, the soluble organic matter and the microorganism from piling up on the outer wall of the membrane separation box, and reducing the speed of membrane pollution.
In the facultative MBR sewage treatment tank 100 in embodiment 1 of the invention, the pulse generator generates upward intermittent hydraulic stirring, so that a sludge concentration gradient is formed from bottom to top in the facultative MBR sewage treatment tank 100, the sludge concentration in the membrane separation zone is low, and membrane pollution is reduced. Meanwhile, the pulse water flow periodically generated by the water distribution pipe hydraulically stirs the sludge and the water, can also scour attachments on the outer wall of the membrane separation tank in the membrane separation water outlet area, and is combined with the use of the air distribution pipe 103, so that the membrane pollution can be effectively reduced, the operation time of the membrane scrubbing fan 104 can be reduced, and the energy consumption is reduced. The operating frequency of the membrane scrubbing fan 104 is reduced, the amount of oxygen supplied to the membrane bioreactor by the membrane scrubbing fan 104 is reduced, the dissolved oxygen in water is lower, the membrane scrubbing fan is in a facultative environment, the growth and the reproduction of microorganisms in slightly polluted water are facilitated, and the interception effect of the membrane is added, so that the high concentration of the activated sludge in the facultative MBR sewage treatment tank 100 is ensured. And with the intermittent operation of the membrane scrubbing fan 104, the biological reaction zone alternately has an anaerobic/anoxic + facultative-anaerobic/anoxic environment, so that a good living environment is provided for the growth of nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria, biological nitrogen and phosphorus removal is realized by the nitrification and denitrification of the bacteria and the phosphorus absorption and release effects, and the purification rate of sewage treatment is improved.
Example 2:
the method aims to solve the technical problems that the traditional aerobic MBR process is used for treating slightly polluted wastewater, and the dissolved oxygen is too high, the energy consumption is high and membrane pollution is easily caused due to excessive aeration. The embodiment 2 of the invention provides facultative MBR sewage treatment equipment, which comprises a rotational flow grit chamber 200, a water distribution chamber 300, a facultative MBR sewage treatment chamber 100 and a clean water tank 400 which are sequentially communicated; in particular, the method comprises the following steps of,
as shown in fig. 2 and 3, a cyclone desander 201 is installed in the cyclone grit chamber 200, and the sewage is pretreated by the cyclone desander 201 to remove hard particles in the inlet water; the rotating speed of the stirrer in the cyclone desander 201 is preferably 12-20 r/min.
As shown in fig. 2 and 3, the water inlet of the water distribution tank 300 is arranged at the upper end of the tank wall, a filter screen 301 is arranged at the water inlet, the water outlet of the rotational flow grit chamber is further filtered by the filter screen 301 to remove particulate matters, insoluble organic matters, fibers and the like carried by the rotational flow grit chamber, the aperture of the filter screen 301 is preferably 40-60 meshes, the water outlet of the water distribution tank 300 is arranged at the bottom of the tank wall, and suspended impurities can be prevented from entering the facultative MBR sewage treatment tank 100 through the water outlet of the water distribution tank 300.
The facultative MBR sewage treatment tank 100 comprises a water inlet area, a mixed reaction area and a membrane separation water outlet area which are arranged from bottom to top, as shown in FIGS. 2 and 3, a water inlet of the water inlet area is communicated with a water outlet of a water distribution tank 300, a water distribution pipeline 101 is arranged at the bottom of the water inlet area, a plurality of water distribution holes with upward openings are uniformly distributed on the water distribution pipeline 101, and the water distribution holes are connected with a pulse generator through connecting pipelines; as shown in fig. 2 and 3, the pulse generator is disposed above the facultative MBR sewage treatment tank 100, is communicated with the water distribution pipe through a central siphon, generates pulse fluctuation through the pulse generator, and is transmitted to the water inlet area through the water distribution pipe 101, so as to stir the dissolved organic matters, microorganisms and activated sludge deposited at the bottom of the water inlet area, so that the dissolved organic matters, microorganisms and activated sludge are fully mixed with the sewage, and the sewage purification effect is improved.
The membrane separation water outlet area is provided with an MBR (membrane bioreactor) membrane separation box 102, sewage is finally purified after being subjected to MBR membrane separation filtration, in addition, in order to avoid the problems that suspended pollutants, soluble organic matters and microorganisms in mixed liquid are easily attached to the surface of a membrane to cause membrane pollution and the membrane flux is reduced, as shown in figures 2 and 3, an air distribution pipe 103 is arranged below the membrane separation box, a plurality of air distribution holes with upward openings are uniformly distributed on the air distribution pipe 103, the air distribution pipe 103 is connected with a membrane scrubbing fan 104 through a connecting pipeline, the membrane scrubbing fan 104 is started to work, the surface of the MBR membrane separation box 102 is swept through the air distribution pipe 103, and attachments such as suspended pollutants, soluble organic matters and microorganisms attached to the surface of the membrane are blown off from the outer wall of the MBR membrane separation box 102.
In order to further avoid the problem of membrane flux reduction caused by membrane pollution, as shown in fig. 2 and 3, a back-washing pipeline 105 is arranged in the membrane separation tank, the back-washing pipeline 105 is connected with a clean water tank 400, clean water is introduced into the membrane separation tank through the back-washing pipeline 105 through the clean water tank 400, so that the pressure intensity inside the membrane separation tank is greater than the pressure intensity outside the membrane separation tank, under the action of the pressure intensity, water flow inside the membrane separation tank reversely permeates to the outside of the tank body, and the generated reverse water flow further flushes away attachments attached to the outer wall of the membrane separation tank.
Meanwhile, a backflow pipeline 106 is arranged between the water inlet area and the membrane separation water outlet area, a backflow port of the backflow pipeline 106 is communicated with the membrane separation area and is arranged close to the membrane separation tank, and a water outlet of the backflow pipeline 106 is connected with the water distribution pipeline 101 of the water inlet area. As shown in fig. 2 and fig. 3 in detail, the facultative MBR sewage treatment tank 100 includes a transition water tank 107, an inlet of the transition water tank 107 is connected to the return pipe 106, and an outlet thereof is connected to the water distribution pipe 101 through a pulse generator. The reflux pipe refluxes the suspended pollutant, the soluble organic matter and the microorganism of membrane separation zone gathering to the bottom of the tank body again, and the pulse power provided by the pulse generator fully mixes and purifies with the sewage entering the tank from the bottom of the tank once more to form an internal circulation, thereby not only avoiding the gathering of a large amount of suspended pollutant, soluble organic matter and microorganism, but also avoiding the gathering of the suspended pollutant, the soluble organic matter and the microorganism from piling up on the outer wall of the membrane separation box, and reducing the speed of membrane pollution.
The clean water tank 400 is communicated with the facultative MBR sewage treatment tank 100 through a water production pump 401, and the water purified in the MBR membrane separation tank 102 is periodically discharged into the clean water tank 400 through the water production pump 401 and then is discharged outside through the clean water tank 400.
According to the facultative MBR sewage treatment equipment disclosed by the embodiment 2 of the invention, large impurities in sewage are crushed by the cyclone desander 201, solid particles, fibers and other impurities in the sewage are effectively intercepted by the filter screen 301, and damage to an MBR membrane is avoided; and the pulse generator generates upward intermittent hydraulic stirring to form a sludge concentration gradient from bottom to top in the facultative MBR sewage treatment tank 100, so that the sludge concentration in the membrane separation area is low, and the membrane pollution is reduced. Meanwhile, the pulse water flow periodically generated by the water distribution pipe hydraulically stirs the sludge and the water, can also scour attachments on the outer wall of the membrane separation tank in the membrane separation water outlet area, and is combined with the use of the air distribution pipe 103, so that the membrane pollution can be effectively reduced, the operation time of the membrane scrubbing fan 104 can be reduced, and the energy consumption is reduced. The operating frequency of the membrane scrubbing fan 104 is reduced, the amount of oxygen supplied to the membrane bioreactor by the membrane scrubbing fan 104 is reduced, the dissolved oxygen in water is lower, the membrane scrubbing fan is in a facultative environment, the growth and the reproduction of microorganisms in slightly polluted water are facilitated, and the interception effect of the membrane is added, so that the high concentration of the activated sludge in the facultative MBR sewage treatment tank 100 is ensured. And with the intermittent operation of the membrane scrubbing fan 104, the biological reaction zone alternately has an anaerobic/anoxic + facultative-anaerobic/anoxic environment, so that a good living environment is provided for the growth of nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria, biological nitrogen and phosphorus removal is realized by the nitrification and denitrification of the bacteria and the phosphorus absorption and release effects, and the purification rate of sewage treatment is improved.
Example 3:
the method aims to solve the technical problems that the traditional aerobic MBR process is used for treating slightly polluted wastewater, and the dissolved oxygen is too high, the energy consumption is high and membrane pollution is easily caused due to excessive aeration. The embodiment 3 of the invention provides a facultative MBR sewage treatment method, and the facultative MBR sewage treatment equipment adopted in the embodiment 2 comprises the following steps:
s1, the wastewater enters a cyclone desanding pool through a water inlet pipeline, and is pretreated by a cyclone desander 201 to remove hard particles in the wastewater; the rotating speed of the stirrer in the cyclone desander 201 is preferably 12-20 r/min.
S2, enabling the effluent of the cyclone sand basin to enter a water distribution basin 300, and filtering and removing impurities by a filter screen 301 to remove particulate matters, insoluble organic matters, fibers and the like carried by the effluent, wherein the aperture of the filter screen is preferably 40-60 meshes.
S3, enabling sewage to enter a water inlet area of the facultative MBR sewage treatment pool 100 through a water outlet of the water distribution pool 300, putting powdered activated carbon into the water, starting a pulse generator and a reflux pump all the time in the operation process of the equipment, mixing and carrying out contact reaction on the sewage and activated sludge in the facultative MBR sewage treatment pool 100 under the pulse stirring of a water distribution pipeline 101, and meanwhile, enabling mixed liquor in a membrane separation area to flow back to the bottom of the facultative MBR sewage treatment pool 100 through the reflux pump, wherein the reflux ratio of the mixed liquor is preferably 200-300%;
and S4, continuously rising the water flow after reaction to a membrane separation water outlet area, completing decontamination treatment after MBR membrane separation and filtration, periodically starting a water production pump 401 to suck and convey the water to a clean water tank 400, and simultaneously periodically starting a membrane scrubbing fan 104 and a flushing pump to perform forward flushing and reverse flushing on the MBR membrane.
According to the facultative MBR sewage treatment method disclosed by the embodiment 3 of the invention, the cyclone desander 201 is used for crushing large impurities in sewage, and the filter screen 301 effectively intercepts impurities such as solid particles, fibers and the like in the sewage, so that damage to an MBR membrane is avoided; and the pulse generator generates upward intermittent hydraulic stirring to form a sludge concentration gradient from bottom to top in the facultative MBR sewage treatment tank 100, so that the sludge concentration in the membrane separation area is low, and the membrane pollution is reduced. Meanwhile, the pulse water flow periodically generated by the water distribution pipe is used for hydraulically stirring the sludge and the water, the attachments on the outer wall of the membrane separation tank in the membrane separation water outlet area can be washed, and the use of the air distribution pipe 103 and the powdered activated carbon is combined, so that the membrane pollution can be effectively reduced, the running time of the membrane scrubbing fan 104 can be reduced, and the energy consumption can be reduced. The operating frequency of the membrane scrubbing fan 104 is reduced, the amount of oxygen supplied to the membrane bioreactor by the membrane scrubbing fan 104 is reduced, the dissolved oxygen in water is lower, the membrane scrubbing fan is in a facultative environment, the growth and the reproduction of microorganisms in slightly polluted water are facilitated, and the interception effect of the membrane is added, so that the high concentration of the activated sludge in the facultative MBR sewage treatment tank 100 is ensured. And with the intermittent operation of the membrane scrubbing fan 104, the biological reaction zone alternately has an anaerobic/anoxic + facultative-anaerobic/anoxic environment, so that a good living environment is provided for the growth of nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria, biological nitrogen and phosphorus removal is realized by the nitrification and denitrification of the bacteria and the phosphorus absorption and release effects, and the purification rate of sewage treatment is improved.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A facultative MBR sewage treatment tank is characterized by comprising a water inlet area, a mixed reaction area and a membrane separation water outlet area which are arranged from bottom to top, wherein,
the bottom of the water inlet area is provided with a water distribution pipeline, and the water distribution pipeline is connected with a pulse generator through a connecting pipeline;
the membrane separation water outlet area is provided with a membrane separation box, a gas distribution pipe is arranged below the membrane separation box and is connected with a membrane scrubbing fan through a connecting pipeline,
meanwhile, a backflow pipeline is arranged between the water inlet area and the membrane separation water outlet area, a backflow port of the backflow pipeline is communicated with the membrane separation area and is arranged close to the membrane separation tank, and a water outlet of the backflow pipeline is connected with a water distribution pipeline of the water inlet area.
2. The facultative MBR sewage treatment tank of claim 1, wherein a filter screen is arranged at the water inlet of the water inlet area.
3. The facultative MBR sewage treatment tank of claim 1, which comprises a transition water tank, wherein the water inlet of the transition water tank is connected with a return pipeline, and the water outlet of the transition water tank is connected with a water distribution pipeline through a pulse generator.
4. The facultative MBR sewage treatment tank of claim 1, wherein a back flush pipeline is arranged in the membrane separation tank, and the back flush pipeline is connected with a clean water pipeline.
5. A facultative MBR sewage treatment device is characterized by comprising a rotational flow grit chamber, a water distribution tank, a facultative MBR sewage treatment tank and a clean water tank which are sequentially communicated; wherein,
a rotational flow desander is arranged in the rotational flow grit chamber;
the water inlet of the water distribution tank is arranged at the upper end of the tank wall, a filter screen is arranged at the water inlet, and the water outlet of the water distribution tank is arranged at the bottom of the tank wall;
the facultative MBR sewage treatment tank comprises a water inlet area, a mixed reaction area and a membrane separation water outlet area which are arranged from bottom to top, wherein a water inlet of the water inlet area is communicated with a water outlet of the water distribution tank, a water distribution pipeline is arranged at the bottom of the water inlet area, and the water distribution pipeline is connected with a pulse generator through a connecting pipeline; the membrane separation water outlet area is provided with a membrane separation box, and a gas distribution pipe is arranged below the membrane separation box and is connected with a membrane scrubbing fan through a connecting pipeline; meanwhile, a return pipeline is arranged between the water inlet area and the membrane separation water outlet area, a return port of the return pipeline is communicated with the membrane separation area and is arranged close to the membrane separation tank, and a water outlet of the return pipeline is connected with a water distribution pipeline of the water inlet area;
the clean water tank is communicated with the facultative MBR sewage treatment tank through a water production pump.
6. The facultative MBR sewage treatment plant of claim 5, wherein a backwash pipeline is arranged in the membrane separation tank and connected with a clean water tank by a flush pump.
7. The facultative MBR sewage treatment equipment of claim 5, wherein the facultative MBR sewage treatment tank comprises a transition water tank, the water inlet of the transition water tank is connected with a return pipeline, and the water outlet of the transition water tank is connected with a water distribution pipeline through a pulse generator.
8. A facultative MBR sewage treatment method, which adopts the facultative MBR sewage treatment equipment of claim 5, and is characterized by comprising the following steps:
s1, enabling the wastewater to enter a cyclone desanding pool through a water inlet pipeline, and pretreating the wastewater through a cyclone desander to remove hard particles in the wastewater;
s2, enabling the effluent of the rotational flow grit chamber to enter a water distribution tank, and filtering by a filter screen to remove impurities;
s3, enabling sewage to enter a water inlet area of the facultative MBR sewage treatment pool through a water outlet of the water distribution pool, putting powdered activated carbon into the water, mixing the sewage with activated sludge in the facultative MBR sewage treatment pool under the pulse stirring of a water distribution pipeline, carrying out contact reaction, and meanwhile, enabling mixed liquid in the membrane separation area to flow back to the bottom of the facultative MBR sewage treatment pool through a reflux pump;
and S4, continuously raising the water flow after reaction to a membrane separation water outlet area, completing decontamination treatment after MBR membrane separation and filtration, and pumping and conveying the water to a clean water tank through a water producing pump.
9. The facultative MBR sewage treatment method of claim 8, wherein the pulse generator and the reflux pump are always started during the operation of the device, and the water production pump, the membrane scrubbing fan and the flushing pump are periodically started.
10. The facultative MBR sewage treatment method of claim 8, wherein the reflux ratio of the mixed liquor is controlled to be 200-300%.
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